As we thought Kong: Skull Island passed King Kong 2005 in it's worldwide box office numbers, they are estimates but should hold. Skull Island is now at $552.3 million, King Kong 2005 finished with $550.5 million (it has already passed Godzilla 2014).
Skull Island's box office numbers have been helped by the international box office which accounts for about 70% of the total take by the film, $391 million. Both Godzilla 2014 and King Kong did around $330 million internationally (China has been Kong: Skull Islands biggest market), Skull Island trails both in the US but has still had a strong showing.
Skull Island has held up pretty well despite having some major films being released right after it, Beauty And The Beast, Boss Baby, Power Rangers, and The Fate of the Furious this weekend, as well as Logan right before.